Double-action pump



E. E. PIGG. DOUBLE ACTION PUMP. APPLICATION msn luwf'zff, 1920.

Patented. My 213 mlmoa ATTORNEY' nnwnnn n. rice, or wieiifrrrenronn, onnanoilra.

DOUBLE-ACTION PUMP.

larmes.

Application lecl June all,

`tritate oiiUklahoma, have invented certain new and uselul improvements in Doublelrction Pumps, ot which the following is a spcciiication. y K y This invention relates to new andQusetul improvements in double acting pumps, and more particularly to the portable hand pump used iniconnection with inliating pneumatic automobile tubes, the primary object of the invention being to devise an arrangement whereby air may be i'orccd Ytrom the pump during either up or down stroke o the piston. y v

An important object ci the invention is to provide an improved upwardly closing valve tor the upper end ot the cylinder which will be assisted in closing by the movement oli the piston rod. u

Another object ot the invention is to provide a device oit the above nature which is strong, durable, inexpensive to manufacture and highly ellicient in practice.

Other objects and advantages ot the invention willbecome apparent during the course off the following description.

ln the accompanying drawings forming a part ot the application and wherein like numerals are employed to designate like parts throughout the several views.

lligure l is a longitudinal section through the invention, and

lll`igure 2 is a longitudinal section through the upper end of the pump illustrating` a modified liorm oit valve. l

.lteterring to the drawings wherein tor the purpose oil illustration are shown preilerred embodiments ol" the invention,tl'1e numeral' ifi designates a base which serves' as a `toot piece 'for maintaining the pump in a verti` cal position, and which is provided with a cavityor recess el, the side walls olf which closely :litfagainst the 'exterior'oi the lower end ot the pump cylinder A disk 6 is lit` ted within the lower end oi the pump cylinder and within ythe cavity 4l to provide the base with an annular channel 7 which ren ceives the lower edge ot a pump cylinder. The disk 6 is provided with a central opening 8, the walls ot which flare outwardly and upwardly whereby a ball valve 9 may be received therein and close downwardly. A. suitable cage il() is iitted uponthe upper end oit 'the opening 8 to prevent displacement ot .Specification of Letters Patent.

llaftented llllay 2li-zt, i922.

1920. Serial No. 391,376.

the ball valve 9 and a passage way 1l is provided in the base 3 to extend from the lower end ot the opening S to the upper surtace olf the base whereby air may be sucked into the cylinder at the proper time.

Nipples l2 are provided for the upper and I lower end ot the cylinder and which extend outwardly ot one side thereof then toward each other as clearly shown in the drawing. The outer edge oit each nipple is provided with-a valve seat whereby a ball valve 'i3 may close upwardly upon its seat and check valve 14; may close downwardly upon the seat ot its respective nipple.. A by-pass or pipe l5 is arranged vertically ot the pump cylinder and in close relation` thereto, opprisite ends 1G ot the pipe being enlargedto form a valve casing for the valves 'i3 and leila Between the ends oit this by-pass a flexible hose 17 is connected whereby air passingv through either check valvev may pass out through the hose 17.

' A; piston or plunger is adapted to reciprocate within the pump cylinder and consists of a pistonhead 1S termed trom a plurality ci? alternately arranged. superposed layers of rubber and steel disks arranged upon the lower end ot the `piston rod i9 and retained thereon by means of lock nuts 20.

rlChe upper end ot the pump cylinder 5 is exteriorly screw threaded for engagement with an interiorly depending screw threaded ilange 21 ot a cap or closure 22, the walls ot which may converge upwardly and inwardly olf the piston rod to terminate in a central opening or passage 23. This opening` communicates' with a chamber @Il formed within the cap by a partition 253 in the lower end thereof. A. 'valve seat is provided centrally o'l the partition and is 'termed by roviding the central portion ot the partition with an annular upwardly and inwardly tapering :llaiige 2G surrounding the central opening in the Inu-tition.` This `flange is provided with circumterentially spaced apertures 27 so that airmay pass through Ythe openings 23 oli the cap into the chamber 24 and through the aperture 2l" into the pump cylinder. ln order lto closefthe aper tures upon 'the upstroke oli" the piston, the valve 28,'preferably constructed et ri'lbber,

is mounted upon the piston rod and is pro-` vided at its lower end with a downwardly and outwardly flaring portion 29 which is adapted to seat upwardly upon the valve seat or within the annular flange 2G. The valve 2S is tubular and is loosely mounted yure f3, l have 'torni of cap and valve, the cap 33 in the presupon the rod The hody portion 30 ot the valve extends upwardly through the cap and opening 23 therein, and its upper end is exteriorly screw threaded so asto receive a packing .nut 3l containing packing 32.

lll rom the i'ioregoing, it will he obvious that upon the start oit the down stroke ot the piston, the valve 28 will be moved slightly ilownwardly through the cap by its contact with the piston rod so as to unseat the valve 2S and permit et air passing through the opening 23 in the cap into the cylinder and thence through the apertures 2? in the tiango 2G and then into thecylinder. rlhe downward movement oit the valve will he checked hy the nut 3l abutting with the top or the cap. The air will continue to be sucked into the upper end ot the cylinderas the piston descends and the ball valve 9 will automatically close to prevent air from escaping' from the lower end of the cylinder through the passageway ll. Simultaneously, the check valve 13 willhe sucked against the seat in the upper nipple l2 while the coacting check valve llt will open and permit air being torcedout of the lower end ot the cylinder through the nipple l2 and thence through the lay-pass into the discharge hose 17. Upon upward strole oit the piston, the inlet valve 9 will open while the check valve ll will hedrawn down against its seat and its coactinr check valve 13 will he opened. The valve 28 oi the cap will he caused to move upwardly against its seat hy its contact with the piston rod and the air being forced up wardly into the cylinder. Consequently, air will be forced out through the upper nipple l2 into the by-path 15 and thence into the discharge hose 17.

In the torni ot' invention disclosed in Figprovided a slightly different ent instance being provided with the inlet opening 34. through which the piston rod 19 extends. lt will be noted that the opening 34 is slightly larger in diameter tl an the piston rod and consequently air is admitted to the cap upon the down stroke ot the piston. The lower end oi the opening Sel flares outwardly as' at 35 to provide the cap with a valve seat, and an upwardly moving valve il@ is mounted upon the piston rod whereby it will close upwardly upon upward movement of the piston. The valve 3G, like the valve 2S in the preceding` form, is engao'ed around the piston rod so that it will not bind the movement ot the rod when the saine is seated. The cap is provided with a depending 37 which is adapted to enclose the valve ani'l to prevent excessive downward movement thereof. The bottom of the cage is provided with a relatively large opening 38 'through which extends the piston rod, and the sides ofthe 'cage are provided. with a plurality ot apertures 39 to permit air entering through the cap to pass into the c vlinder.

lfroin the operation olt the preceding torni and the construction oi" the modilicd torni. it

will he obvious that upon upi Yard movement of the piston, the valve `will he caused to move vertically into engagement with ii's seat 35 to prevent the escape ot air through the upper end oit the cylinder. l'lowevcr, upon downward movement ot the piston. the valve 3G will move downwardly oi iis seat until it contacts with the bottoni of the cage 238, whei'eiipoii turther downward movement of the valve will he prohibited.

The foregoing description and the panying drawings have reference to the preferred or approved enihodimcnt oi" my invention. lt is to he understood however that such changes may he made in construction and arrangement o'll parts. inaterialz-s. dimensionsr` etc., as may prove expedient and tall within the scope o'l the appended claims.

Having thus 'tully dcscrilnvl my invention what l. claim as new and desire to secure hy Letters Patent is:

l. A double acting pump coinprisiiur :i cylinder.y a hy-pass communicating with the upper and lower ends ot the cyliiulcr and leading to a common outlet. a checlv valve :it each end ot the bjc-passl :in air inlct valve vtor the lower end ot the cylinderw a piston in the cylinder, a cap tor the upper end ol" the cylinder through which the piston passes. an air inlet valve ttor the upper end otL the cylinder trictionally mounted upon the npper end ot the piston, and a partition carried hy the cap and spaced 'troni the top theicot 'for liniiting'the movement oi" the valve carried by the piston.

2. A double action piniip comprising a cylinder, a hy-pass communicating with the ends ot the cylinder, and leading to a common outlet, a check valve in each end ol thc lay-pass. :in air inlet valve l'or one end ol' the cylinder, a, pistou mounted in the cylinder` :i piston rod, a cap tor the other end oiE thc cylinder havingan opening` therein lor the passage ot said piston rod. a sleeve valve trictionally engaged with the upper rnd ot the piston rod and adapted to extend through the openingv in the cap. a partition carried hv the cap and having an opening therein ior the aussage of the rod and valveand adapted to restrict the outward movement o'l the valve, and the upper end oi the valve heinn enlarged to torni an abutment adapted to contact with the cap tor limiting the inward movement of the valve.

In testimoni,7 whereot .l afiix in v signature in presence ot two witnesses.

Vvritnesses J. H. BoLLnNnxcii, E, lll. Bunnies.

(Ill 

